Alert archive / Colorado / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 3, NWS Denver/Boulder, CO

May 15, 1990Boulder County, Jefferson County, Weld County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 15, 1990, 1:47 PM MDT for Boulder County, Jefferson County, Weld County, Colorado. It was in force for 30 min.

The area

The counties it named.

The facts

Issued
May 15, 1990, 1:47 PM MDT (19:47 UTC)
Expired
May 15, 1990, 2:17 PM MDT
In force
30 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

Counties Boulder County, CO, Jefferson County, CO, Weld County, CO

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 7.8 hours before the alert went out and 153 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Denver, CO at 12:00Z on 1990-05-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 14 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 1990-05-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 square meters per square second.1939587897117136Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
14 J/kg
Mixed-layer CIN
-269 J/kg
Mixed-layer LCL
1623 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
73 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KDEN 151951
SVRDEN
COC059-005-031-001-013-123-152017-

BULLETIN...IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
147 PM MDT TUE MAY 15 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 217 PM  MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES OF NORTHEAST COLORADO:

     NORTHEASTERN JEFFERSON
     NORTHWESTERN ARAPAHOE
     NORTHERN DENVER
     WESTERN ADAMS
     SOUTHEASTERN BOULDER
     EXTREME SOUTHWESTERN WELD

INCLUDING THE FOLLOWING TOWNS/CITIES:

     ARVADA..AURORA..BROOMFIELD..COMMERCE CITY..DACONO..DENVER..
     ERIE..LAFAYETTE..LAKEWOOD..LOUISVILLE..MOUNTAIN VIEW..
     NORTHGLENN..PLEASANT VIEW..SUPERIOR..THORNTON..
     WESTMINSTER..AND WHEAT RIDGE

AT 145 PM DOPPLER RADAR INDICATES A LINE OF THUNDERSTORMS MOVING EAST
OFF THE FOOTHILLS WITH STRONG WINDS GUSTING AS HIGH AS 60 TO 70 MPH.
SEVERE WINDS ARE THE MAIN THREAT WITH THIS STORM ALTHOUGH SMALL HAIL IS
ALSO POSSIBLE.

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT
AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE
IN DENVER..OR CALL YOUR REPORT TO THE NATIONAL WEATHER SERVICE
AT 361-0663.  DO NOT CALL THIS NUMBER FOR "INFORMATION.

SZOKE/HOLZINGER

LAT..LON  3971 10485 3970 10521 4009 10523 4010 10488

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 15, 1:47 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Denver30 min

Nearby

Severe Thunderstorm Warnings in Colorado, 1990Every severe thunderstorm warning in 1990

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.